![]() Incidence proportion is a measure of the risk of disease or the probability of developing the disease during the specified period.Risk = “Food-specific attack rate” = (30 ⁄ 99) × 100 = 0.303 × 100 = 30.3% Properties and uses of incidence proportions Numerator = 30 persons who ate potato salad and developed gastroenteritisĭenominator = 99 persons who ate potato salad Calculate the risk of illness among persons who ate potato salad. ![]() Numerator = 100 deaths among the diabetic menĮxample B: In an outbreak of gastroenteritis among attendees of a corporate picnic, 99 persons ate potato salad, 30 of whom developed gastroenteritis. Calculate the risk of death for these men. EXAMPLES: Calculating Incidence Proportion (Risk)Įxample A: In the study of diabetics, 100 of the 189 diabetic men died during the 13-year follow-up period.
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